Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
visit ASHRAE's Bookstore.
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| bearing | machine part in which another part (as a journal
or pin) turns or slides |
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| bellows | 1.
flexible corrugated chamber which converts pressure variation into mechanical movement.
2.
flexible fluid‑containing vessel that will expand or contract as a result of a
change in the pressure of the contained fluid. Can be used to transmit force
and/or motion in a pneumatic or hydraulic system or as a sensor of temperature
or pressure when the bellows is sealed.
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| bias | tendency of an estimate to deviate in one
direction from a true value (a systematic error). See error. Compare precision |
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| bimetallic element | actuating element consisting of two strips of
metal with different coefficients of thermal expansion attached so that
internal strains caused by temperature changes bend the compound strip to open
or close contacts, or a pneumatic device |
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| binary | characteristic or property involving a
selection, choice, or condition in which there are two possibilities (as binary
numbers in a computer, on-off, or open-closed switch position). |
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| blackbody |
1. body that absorbs all the radiant energy
falling on it.
2.
body that has the maximum theoretical radiant energy emittance at a given
temperature. See also absorber. |
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| blast area ratio | blast area divided by the fan outlet area |
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| blast gate |
heavy-duty duct closure device. |
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| bleeder |
pipe attached to a unit, as a condenser, to
bleed off liquid refrigerant parallel to main flow. |
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| blowdown |
1.
discharge of water from a steam boiler or open recirculating system that
contains high total dissolved solids.
The addition of makeup water will reduce the concentration of dissolved
solids to minimize their precipitation. 2. in pressure-relief devices, the difference
between actuation pressure of a pressure-relief valve, and reseating pressure,
expressed as a percentage of set pressure, or in pressure units |
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